Photocoupler
Note:
1. Connect as shown above.
2. Change the size of Rx Even if the current of the base circuit changes, the frequency changes.
3. Increasing the capacitance is beneficial to the bass feedback to the base of the first transistor, so the final output frequency becomes lower.
4, R2 is connected to the photoresistor, A, B is connected to the resistor, the light alarm. Select appropriate resistor at R1, and connect the photoresistor at A and B to light and dark alarm.
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